221002100209997 has 2 divisors, whose sum is σ = 221002100209998. Its totient is φ = 221002100209996.

The previous prime is 221002100209967. The next prime is 221002100210069. The reversal of 221002100209997 is 799902001200122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198167024906761 + 22835075303236 = 14077181^2 + 4778606^2 .

It is a cyclic number.

It is not a de Polignac number, because 221002100209997 - 2¹⁴ = 221002100193613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221002100209967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110501050104998 + 110501050104999.

It is an arithmetic number, because the mean of its divisors is an integer number (110501050104999).

Almost surely, 2^{221002100209997} is an apocalyptic number.

It is an amenable number.

221002100209997 is a deficient number, since it is larger than the sum of its proper divisors (1).

221002100209997 is an equidigital number, since it uses as much as digits as its factorization.

221002100209997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 44.

The spelling of 221002100209997 in words is "two hundred twenty-one trillion, two billion, one hundred million, two hundred nine thousand, nine hundred ninety-seven".